Yeah, we just dipped down to about 60F (about 16C) the other morning. BRRRRRRR!
I like the theory of hearing better when your head is less clogged up. I have pretty bad allergies and sinus issues, but when I was going to college in Indiana, I would LOVE the winters because I could wake up every morning without being stuffed up. Would make sense that the clearer your head is, the better your ears work.